count.points.id {adehabitat} | R Documentation |
count.points
counts the number of points in
each pixel of a raster map of class kasc
or asc
.
count.points.id
counts the number of points in
each pixel of a raster map of class kasc
or asc
, for
different sets of points (e.g. the relocations of several animals
monitored using radio-tracking)
count.points(xy, w) count.points.id(xy, id, w)
xy |
a data frame with 2 columns containing the x and y coordinates of the points. |
id |
a factor giving, for each point, the membership of a point to a set. |
w |
an object of class asc , kasc or mapattr . |
count.points
returns an object of class asc
containing the number of points in each cell of the raster
map.
count.points.id
returns an object of class kasc
,
with one column per level of the factor id
,
containing the number of points numbered in each cell of the raster
map.
Clement Calenge clement.calenge@oncfs.gouv.fr
kasc
for additionnal information on objects
of class kasc
, and storemapattr
for further
information on objects of class mapattr
.
data(puechabon) kasc <- puechabon$kasc locs <- puechabon$locs ## Counts the number of relocations of each wild boar ## per pixel of the raster map (nlocrast <- count.points.id(locs[,4:5], locs[,1], kasc)) image(nlocrast) ## Counts the number of all relocations ## per pixel of the raster map (nlocrast <- count.points(locs[,c("X","Y")], kasc)) image(nlocrast)